NAPLES, Italy — Chicago is famed for its fabulously cheesy deep-dish pizza, but Naples, it is generally agreed, is where the savory thin-crust version of the pie was born. My friend Therese and I, ...

Ernesto Di Maio is severely allergic to the yeast in leavened foods. "I have to go somewhere and hide because I will be fully covered with bumps and bubbles on the whole body," he says. "It's really ...